Pertaining to the clinical-related characteristics as predictors of VF, of the records retrieved from the data bases, 5 had disaggregated data on functional status (working or ambulatory); 4, on body mass index (underweight or normal); 13, on CD4 T-cell count (low or normal); 5, on haemoglobin concentration (anaemic or normal); 11, on WHO HIV staging (stage I/II or stage III/IV); 6, on TB (HIV/TB co-infection or HIV mono-infection); 6, on other opportunistic infections (positive or negative). This evidence concerns the gene CD4 and Opportunistic infection.